ValoreBooks.com is extremely reliable compared to other online used textbook retailers.  They offer a toll-free customer service line (1-888-VALORE 1) whereby a real person answers the phone, and NOT some annoying phone system that makes it impossible to speak with a real person.

They offer an automatic 5% discount on all purchases year round with the use of coupon code: suprchp and are quick to offer refunds or partial refunds if the customer is not completely satisfied.  Their system is easy to navigate and search for books by title, author, or ISBN #.

They have saved me literally hundreds of dollars each semester. I would highly recommend Valore Books.com